nodes: own node as Wownero default; fix Arbitrum RPC; drop keyless NOWNodes

- Wownero default becomes node.wownero.org:443 (SSL, ours) instead of a
  third-party plaintext host
- Arbitrum's default was arbitrum.nownodes.io, which requires an API key
  we don't ship (nowNodesApiKey is empty) — every fresh install had a dead
  default RPC; now arbitrum-one-rpc.publicnode.com
- remove the other NOWNodes entries from node lists and the EVM chain
  registry for the same reason; historical migration maps keep their
  entries so old users still get migrated off

assets/arbitrum_node_list.yml

@@ -1,12 +1,8 @@
 -
-  uri: arbitrum.nownodes.io
+  uri: arbitrum-one-rpc.publicnode.com
   is_default: true
   useSSL: true
   isEnabledForAutoSwitching: true
 -
   uri: arbitrum.drpc.org
   useSSL: true
--
-  uri: arbitrum-one-rpc.publicnode.com
-  useSSL: true
-  isEnabledForAutoSwitching: true

assets/base_node_list.yml

@@ -1,7 +1,3 @@
--
-  uri: base.nownodes.io
-  useSSL: true
-  isEnabledForAutoSwitching: true
 -
   uri: base.llamarpc.com
   useSSL: true

assets/polygon_node_list.yml

@@ -8,7 +8,5 @@
 -
   uri: polygon.llamarpc.com
   useSSL: true
--
-  uri: matic.nownodes.io
   useSSL: true
   isEnabledForAutoSwitching: true

assets/wownero_node_list.yml

@@ -1,6 +1,6 @@
 -
   uri: node.wownero.org:443
-  is_default: false
+  is_default: true
   useSSL: true
   isEnabledForAutoSwitching: true
 -
@@ -10,7 +10,7 @@
   isEnabledForAutoSwitching: true
 -
   uri: node3.monerodevs.org:34568
-  is_default: true
+  is_default: false
   useSSL: false
   isEnabledForAutoSwitching: true
 -

cw_evm/lib/evm_chain_registry.dart

@@ -43,7 +43,6 @@ class EvmChainRegistry {
           'eth.llamarpc.com',
           'rpc.flashbots.net',
           'eth-mainnet.public.blastapi.io',
-          'eth.nownodes.io',
           'ethereum.publicnode.com',
         ],
         explorerUrls: [
@@ -77,7 +76,6 @@ class EvmChainRegistry {
           'polygon-rpc.com',
           'polygon-bor-rpc.publicnode.com',
           'polygon.llamarpc.com',
-          'matic.nownodes.io',
         ],
         explorerUrls: [
           'https://polygonscan.com',
@@ -107,7 +105,6 @@ class EvmChainRegistry {
           supportsENS: false,
         ),
         defaultRpcEndpoints: [
-          'base.nownodes.io',
           'base.llamarpc.com',
           'base-rpc.publicnode.com',
           '1rpc.io/base',
@@ -140,7 +137,6 @@ class EvmChainRegistry {
           supportsENS: false,
         ),
         defaultRpcEndpoints: [
-          'arbitrum.nownodes.io',
           'arbitrum.drpc.org',
           'arbitrum-one-rpc.publicnode.com',
         ],

lib/entities/default_settings_migration.dart

@@ -45,13 +45,13 @@ const nanoDefaultPowNodeUri = 'rpc.nano.to';
 const solanaDefaultNodeUri = 'solana-mainnet.core.chainstack.com';
 const tronDefaultNodeUri = 'api.trongrid.io';
 const newCakeWalletBitcoinUri = 'electrum.blockstream.info:50002';  // Hash Bags: default flipped to Blockstream
-const wowneroDefaultNodeUri = 'node3.monerodevs.org:34568';
+const wowneroDefaultNodeUri = 'node.wownero.org:443';
 const zanoDefaultNodeUri = '37.27.100.59:10500';
 const moneroWorldNodeUri = '.moneroworld.com';
 const decredDefaultUri = "default-spv-nodes";
 const dogecoinDefaultNodeUri = 'dogecoin.stackwallet.com:50022';
 const baseDefaultNodeUri = 'base-rpc.publicnode.com';
-const arbitrumDefaultNodeUri = 'arbitrum.nownodes.io';
+const arbitrumDefaultNodeUri = 'arbitrum-one-rpc.publicnode.com';
 const bscDefaultNodeUri = 'bsc-dataseed.bnbchain.org';
 
 Future<void> defaultSettingsMigration(